Dynamics of Lead Screw and Nut

The reasons for choosing this friction model are twofold. This model structure allows for the three above-mentioned components of friction to be easily separated for the purpose of focused analysis. In addition, it was found that this particular formula lends itself very well to the experimental observations reported in Chap. 9. 

The equations of motion of this system (based on the notations of Fig. 2.7) can be written as 

In addition, the contact normal force between the threads is found as 

Note that due to the appearance of sgn(N), through /ij, in the denominator of (5.14), this equation is solved iteratively for N. 

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